Date
1 - 19 of 19
AP Quad TCC with TEC and Stellarvue scopes
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Roland Christen
Hi Astronuts,
A little bit of misinformation has crept in again on Cloudy nights about our Quad TCC. This was stated today by a well-meaning person:
"The AP Quad TCC will not produce round stars at the edge of the IMX455." This may be true of our shorter 130GTX but the longer scopes produced by TEC and Stellarvue have less field curvature than the short 130 (longer refractors have longer radius field curvatures and are thus easier to correct).
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue SVX152T. Spacers are available for these scopes to get the 80.8mm standard back spacing that Canon and Nikon use. All these scopes will produce diffraction limited stars into the corners. The longer 152, 160 and 180 scopes will actually cover a larger circle than the IMX455. Below are some examples of the actual diffraction image (AiryDisc at critical focus) from the center to corner of some of these scopes using the AP Quad TCC.
The Quad TCC will fit nicely into the 3.5" Starlight Feathertouch focusers using our handy dovetail adapter.
TEC140ED:
 TEC160FL:
 -- Roland Christen Astro-Physics |
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Bill Long
Duly noted and corrected on CN.
I dont suppose the TOA150 is compatible with the Quad TCC for a big sensor?
🙂
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Roland Christen via groups.io <chris1011@...>
Sent: Saturday, March 19, 2022 4:28 PM To: main@ap-ug.groups.io <main@ap-ug.groups.io>; main@ap-gto.groups.io <main@ap-gto.groups.io> Cc: george@... <george@...>; marj@... <marj@...>; karen@... <karen@...> Subject: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes Hi Astronuts,
A little bit of misinformation has crept in again on Cloudy nights about our Quad TCC. This was stated today by a well-meaning person:
"The AP Quad TCC will not produce round stars at the edge of the IMX455." This may be true of our shorter 130GTX but the longer scopes produced by TEC and Stellarvue have less field
curvature than the short 130 (longer refractors have longer radius field curvatures and are thus easier to correct).
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue
SVX152T. Spacers are available for these scopes to get the 80.8mm standard back spacing that Canon and Nikon use. All these scopes will produce diffraction limited stars into the corners. The longer 152, 160 and 180 scopes will actually
cover a larger circle than the IMX455. Below are some examples of the actual diffraction image (AiryDisc at critical focus) from the center to corner of some of these scopes using the AP Quad TCC.
The Quad TCC will fit nicely into the 3.5" Starlight Feathertouch focusers using our handy dovetail adapter.
TEC140ED:
 TEC160FL:
 -- Roland Christen Astro-Physics |
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ap@CaptivePhotons.com
On Sat, Mar 19, 2022 at 07:28 PM, Roland Christen wrote:
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue SVX152T.Good to know. I just ordered the SVX152T with their flattener, but am quite interested in this as a reducer as theirs does not offer much backfocus. I assume it would also go on the end of a nitecrawler. Same thing, with an S35RFAA on the OTA side and step down adapters on the camera side as in the FF-TCC imaging train chart? Are you making these currently, or are they only available used? Linwood |
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Bill Long
Ron makes a WR35 to AP Dovetail adapter for the Quad TCC and AP 3.5" 130FF Field Flattener. You thread that onto the Drawtube or one of the Extensions and slide the Quad TCC in that adapter and secure it with 3 large set screws. Alternatively, you could have
Ron make a WR35 to 4.100” x 24 tpi adapter, then thread this onto it: 3.5" Rotating Focuser Endcap. Required for TEC Refractors to use QUADTCC. Threads into TEC Focusers (S35RFAA) -
Astro-Physics but that would cost much more than just the single adapter from Ron that works great.
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of ap@... <ap@...>
Sent: Saturday, March 19, 2022 4:43 PM To: main@ap-gto.groups.io <main@ap-gto.groups.io> Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 07:28 PM, Roland Christen wrote:
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue SVX152T.Good to know. I just ordered the SVX152T with their flattener, but am quite interested in this as a reducer as theirs does not offer much backfocus. I assume it would also go on the end of a nitecrawler. Same thing, with an S35RFAA on the OTA side and step down adapters on the camera side as in the FF-TCC imaging train chart? Are you making these currently, or are they only available used? Linwood |
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Roland Christen
The TOA is a special beast. I have an idea what the design is, but I'm not certain, so I would be guessing at the correct spacing. Most scopes follow a predictable field curvature, shorter scopes having more, longer having less. When you add large airspaces, it complicates things a bit, in some cases it produces a bit more field curvature.
For the TEC scopes, Yuri provided me the exact optical design, so I didn't have to guess (I had a pretty good idea since oil spaced fluorite lenses have only a very small window of glass types and radii that you can choose). I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.
Rolando
-----Original Message-----
From: Bill Long <bill@...> To: main@ap-gto.groups.io <main@ap-gto.groups.io> Sent: Sat, Mar 19, 2022 6:36 pm Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes
Duly noted and corrected on CN.
I dont suppose the TOA150 is compatible with the Quad TCC for a big sensor?
🙂
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Roland Christen via groups.io <chris1011@...>
Sent: Saturday, March 19, 2022 4:28 PM To: main@ap-ug.groups.io <main@ap-ug.groups.io>; main@ap-gto.groups.io <main@ap-gto.groups.io> Cc: george@... <george@...>; marj@... <marj@...>; karen@... <karen@...> Subject: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes Hi Astronuts,
A little bit of misinformation has crept in again on Cloudy nights about our Quad TCC. This was stated today by a well-meaning person:
"The AP Quad TCC will not produce round stars at the edge of the IMX455." This may be true of our shorter 130GTX but the longer scopes produced by TEC and Stellarvue have less field
curvature than the short 130 (longer refractors have longer radius field curvatures and are thus easier to correct).
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue
SVX152T. Spacers are available for these scopes to get the 80.8mm standard back spacing that Canon and Nikon use. All these scopes will produce diffraction limited stars into the corners. The longer 152, 160 and 180 scopes will actually
cover a larger circle than the IMX455. Below are some examples of the actual diffraction image (AiryDisc at critical focus) from the center to corner of some of these scopes using the AP Quad TCC.
The Quad TCC will fit nicely into the 3.5" Starlight Feathertouch focusers using our handy dovetail adapter.
TEC140ED:
 TEC160FL:
 -- Roland Christen Astro-Physics -- Roland Christen Astro-Physics |
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Roland Christen
The QTCC fits our 3.5" dovetail system that attaches directly to the Starlight 3.5" focuser. I have no idea what the Night Crawler uses.
Right now we have a few Quad TCCs in stock but we are going to be making another run. So they should be available soon.
Roland
-----Original Message-----
From: ap@... <ap@...> To: main@ap-gto.groups.io Sent: Sat, Mar 19, 2022 6:43 pm Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 07:28 PM, Roland Christen wrote:
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue SVX152T.Good to know. I just ordered the SVX152T with their flattener, but am quite interested in this as a reducer as theirs does not offer much backfocus. I assume it would also go on the end of a nitecrawler. Same thing, with an S35RFAA on the OTA side and step down adapters on the camera side as in the FF-TCC imaging train chart? Are you making these currently, or are they only available used? Linwood -- Roland Christen Astro-Physics |
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Roland Christen
Any other questions you have I will answer on Monday. Gotta go now, get some dinner and quaff a 1/2pint.
Rolando
-----Original Message-----
From: chris1011@... To: main@ap-gto.groups.io <main@ap-gto.groups.io> Sent: Sat, Mar 19, 2022 6:57 pm Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes The QTCC fits our 3.5" dovetail system that attaches directly to the Starlight 3.5" focuser. I have no idea what the Night Crawler uses.
Right now we have a few Quad TCCs in stock but we are going to be making another run. So they should be available soon.
Roland
-----Original Message-----
From: ap@... <ap@...> To: main@ap-gto.groups.io Sent: Sat, Mar 19, 2022 6:43 pm Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 07:28 PM, Roland Christen wrote:
Our Quad TCC will certainly cover the full frame IMX455 chip with round stars into the corners for the TEC140F7 ED, TEC140F7FL, TEC160FL, TEC180FL, as well as the Stellarvue SVX152T.Good to know. I just ordered the SVX152T with their flattener, but am quite interested in this as a reducer as theirs does not offer much backfocus. I assume it would also go on the end of a nitecrawler. Same thing, with an S35RFAA on the OTA side and step down adapters on the camera side as in the FF-TCC imaging train chart? Are you making these currently, or are they only available used? Linwood -- Roland Christen Astro-Physics |
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ap@CaptivePhotons.com
On Sat, Mar 19, 2022 at 08:00 PM, Roland Christen wrote:
get some dinner and quaff a 1/2pint.1/2pint seems inadequate to go with dinner. :) Thanks for the info! Linwood |
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Terri Zittritsch
I am really pleased with the performance of QTCC on my TEC140 and if all goes as planned, I'll be able to test it on a 180 in 3 months! Terri |
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Scott Cooke
It sounds like it would probably work well on my CFF 185 F6.8 which is also an oiled triplet. Since the focal length is the same as the TEC 180FL, would the spacing be the same? Thanks, Scott On Sun, Mar 20, 2022 at 8:26 AM Terri Zittritsch <theresamarie11@...> wrote:
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Nick Iversen
Can you post images for the 130GTX? It would be useful to see them.
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Roland Christen
No guarantees since the design is proprietary.
Roland
-----Original Message-----
From: Scott Cooke <TSCOOKE64@...> To: main@ap-gto.groups.io Sent: Sun, Mar 20, 2022 11:17 am Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes It sounds like it would probably work well on my CFF 185 F6.8 which is also an oiled triplet. Since the focal length is the same as the TEC 180FL, would the spacing be the same?
Thanks,
Scott
On Sun, Mar 20, 2022 at 8:26 AM Terri Zittritsch <theresamarie11@...> wrote:
-- Roland Christen Astro-Physics |
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On Sat, Mar 19, 2022 at 04:52 PM, Roland Christen wrote:
For the TEC scopes, Yuri provided me the exact optical design, so I didn't have to guess (I had a pretty good idea since oil spaced fluorite lenses have only a very small window of glass types and radii that you can choose). I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.This is definitely good to know Roland. I am expecting a new TEC140FL in the next few months. Is the Quad TCC and its required adapters for the TEC usually available off the shelf or is there a waiting list? I was going to wait until I actually got my notice from TEC to purchase the Quad TCC. -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ |
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Roland Christen
We have a limited number available, but he who hesitates is ....
Rolando
-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...> To: main@ap-gto.groups.io Sent: Wed, Mar 30, 2022 10:31 am Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 04:52 PM, Roland Christen wrote:
For the TEC scopes, Yuri provided me the exact optical design, so I didn't have to guess (I had a pretty good idea since oil spaced fluorite lenses have only a very small window of glass types and radii that you can choose). I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.This is definitely good to know Roland. I am expecting a new TEC140FL in the next few months. Is the Quad TCC and its required adapters for the TEC usually available off the shelf or is there a waiting list? I was going to wait until I actually got my notice from TEC to purchase the Quad TCC. -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ -- Roland Christen Astro-Physics |
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On Sat, Mar 19, 2022 at 07:52 PM, Roland Christen wrote:
I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.Would you be willing to risk an estimate of the backfocus range for it? It says nominally 80.8 +/- 1 for (I presume) AP scopes. Think that's good say +/- 2, or are we talking +/- 20 for the SVX152T? Their FR is only 74mm (well, it's 79, but there is a required 5mm adapter). i'm going to be 5mm long. I would need to ask about how to connect it to the NiteCrawler and what if any backfocus that consumes but I suspect they have that info. EDITED AFTER: I realize I mixed up two things here. The field flattener (not reducer) from SV is 79mm, this is a flattener and reducer I think, so it is not the same thing. I am still interested, but it does not solve my problem of backfocus at native focal length. Linwood |
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On Wed, Mar 30, 2022 at 08:49 AM, Roland Christen wrote:
We have a limited number available, but he who hesitates is ....... required to wait for the next batch. :-) -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ |
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Bill Long
The site does not show them in stock though:
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Roland Christen via groups.io <chris1011@...>
Sent: Wednesday, March 30, 2022 8:49 AM To: main@ap-gto.groups.io <main@ap-gto.groups.io> Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes We have a limited number available, but he who hesitates is ....
Rolando
-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...> To: main@ap-gto.groups.io Sent: Wed, Mar 30, 2022 10:31 am Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 04:52 PM, Roland Christen wrote:
For the TEC scopes, Yuri provided me the exact optical design, so I didn't have to guess (I had a pretty good idea since oil spaced fluorite lenses have only a very small window of glass types and radii that you can choose). I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.This is definitely good to know Roland. I am expecting a new TEC140FL in the next few months. Is the Quad TCC and its required adapters for the TEC usually available off the shelf or is there a waiting list? I was going to wait until I actually got my notice from TEC to purchase the Quad TCC. -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ -- Roland Christen Astro-Physics |
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Roland Christen
It's probably similar to what's required for the 160 F7 TEC refractor.
The 80.8 back focus is achieved with the matching spacer that is added to the back of the QTCC. In the case of the 160F7 TEC, that is a 17mm spacer. You can choose to not use that spacer, and then you would have 97.8mm of back distance from the reducer's flange. For a 152 F8 scope the exact back spacing required is a bit more forgiving, so you don't have to be dead nuts on to get round stars over the full frame. If the stars are elongated pointing toward the center, your distance is too long.
Roland
-----Original Message-----
From: ap@... <ap@...> To: main@ap-gto.groups.io Sent: Wed, Mar 30, 2022 11:26 am Subject: Re: [ap-gto] AP Quad TCC with TEC and Stellarvue scopes On Sat, Mar 19, 2022 at 07:52 PM, Roland Christen wrote:
I doubt that Stellarvue will be as forthcoming, but I can pretty much know what the design is. At F8 it is the easiest to correct for field curvature than the F7 TEC scopes. It also will have a bit more latitude as far as exact rear spacing. With the QTCC it would produce approximately F5.8 with about a 3 degree diffraction limited field.Would you be willing to risk an estimate of the backfocus range for it? It says nominally 80.8 +/- 1 for (I presume) AP scopes. Think that's good say +/- 2, or are we talking +/- 20 for the SVX152T? Their FR is only 74mm (well, it's 79, but there is a required 5mm adapter). i'm going to be 5mm long. I would need to ask about how to connect it to the NiteCrawler and what if any backfocus that consumes but I suspect they have that info. Linwood -- Roland Christen Astro-Physics |
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Howard Ritter
…curved?
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Show quoted text
—howard
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